Fulcruming action pavement breaker



5 Sheets-Sheet 1 mf/ NW *ma F. J. HALEY FULCRUMING ACTION PAVEMENT BREAKER March 17, 1959 Filed vFeb. 13, 1957 Arrow/5x5.

March 17, 1959 F. J. HALEY 2,878,002

FULCRUMING ACTION PVEME-T BREAKER Filed Feb. 13, 195'? sheets-lsheet 2 Malsch 17, 1959 v F. J..HALEY .l 8722002 FULCRUMING ACTION PAVEMENT BREAKR Filed Feb. 13, 1957 3 Sheets-*Sheet 3 Uni@ A Sie@ Patent- 2,878,002 FULCRUMING ACTION PAVEMENT BREAKER Francis J. Haley, Terre Haute, Ind. Application February 13, 1957, Serial No. 639,936 15 Claims. (Cl. 262-9) This invention relates to an apparatus for breaking up pavement, and more particularly to an apparatusfor.

breaking up a strip of pavement.

, It has heretofore been the practice of those skilled in to employ the use of4 The former.. being adapted for use on large areas of paved'surface" the art of pavement destruction dropping Weights or plow-like devices.

of relatively great thickness is cumbersome and not easily adapted for transportation from `one worklocation to another. While the plow-like'type of apparatus may be easily transported from one location to another, itsv use is necessarily limited to relatively thin layers of pavement. Further, both types of apparatus have an inherent disadvantage in that the area of pavement break` up is difficult to confine within the desired limits of' destruction.

' Itis the general object of my invention to meet and' overcome the disadvantages of previously existing equipment as set forth above. More specifically, it is an object of my invention to provide a rigidly constructed apparatus which will effect a controlled break-up rela? tively thick layers of pavement within a defined area, such as may be required for pipe laying operations. It is an object of my invention to provide an apparatus which will effect a pavement break-up with a minimal power requirement, and which can be easily transported fromv one work location to another.

In accordance-with my invention there is provided a' main supporting platform carried upon retractable transporting wheels. Extending downwardly from each lateral side of said platform is a ground engageable runner adapted to form an axle support for said wheels when the latter are in an unretracted ground engaging position. Said runners are provided along their undersides` with a pavement cutting knife-edge adapted to define the limit of pavement destruction.

l A break-up hook is suspended from said platform in.

parallelism with and intermediate said runners. The hook is vertically and longitudinally movable for effecting pavement break-up by any suitable power means, conveniently fluid operated cylinders.

Desirably, the apparatus is connected to vehicle for transporting it from one work location to another by means of a telescoping tongue connected to the break-up hook. In addition to serving as a means of locomotion for said apparatus, said vehicle further serves as a deadfman during the break-up operations.

" The laccompanying drawings illustrate my invention.,

In such drawings:

Fig. 1 is a longitudinal section of a pavement breaker embodying my invention connected to a transporting vehicle, and showing said breaker in transporting position and work-engaging position by dotted and chain link lines respectively;

Fig. 2 is a vertical section taken on the line 2-2 of Fig. l;

. Eig. 3 is a plan view of the pavement breaker shown a ground-engaging position for transporting said ap- Patented Mar. 17, l19t-"i9 in Fig. 1 with parts broken away to show the hook mounting; Fig. 4 is a vertical section of my breaker in a pavement-breaking position; and

Pig. 5 is a diagram of a hydraulic system for my' pavement breaker.

As shown in Fig. 1, my pavement breaking apparatus is provided with a main platform assembly having a base platform section 10 surmounted by a cross-brace platform section 12. Said sections are constructed of any suitable rigid structural material. Conveniently, I employ steel I-beam 14 rigidly welded to each other and' to the beams comprising the adjacent platform section.

A transporting wheel 16 mounted on an axle 18 isIv disposed at each side of the apparatus. Each axle 18 is.

connected to a ram 20 operable by a double acting'hy# draulic cylinder 22 secured in suitable recesses 24 in' theplatform section 10. The wheels 16 are retractable, such that when the rams 20 are raised, said wheels are' pulled into a retracted position away from the ground; and when said rams are lowered, the wheels lower into paratus from one work location to another.

AA runner 30, extending longitudinally of the platform.'

section 10 is welded to the underside thereof adjacent each of its lateral edges. Each of said runners is braced by a gusset 34 extending longitudinally of said runners the lower arm 40 is tapered to a pointed tip 46 to facili tate the longitudinal movement of said arm through the and interconnecting the lower portions thereof to the' platform section 10. An outer fiange 32 on the lower end of said runners forms a shoulderupon which the axles 18 are received when the wheels 16 are in lowered.

of the platform section 10 with their forward ends turned upwardly so that said runners may be easily slid over the pavement when the wheels 16 are in retracted position.

A triangularly shaped skid, preferably made of hardened steel and forming a knife-edge 36, is secured at the underside of each of the runners 30. The knife-edge cuts into the pavement surface during the pavement break-l ing operations and thereby defines the lateral limitsv ofy break-up.

The breaking force is applied to the Said hook is mounted below the platform section 10 in parallelism with and intermediate the runners 30 and has its open end presented forwardly. The leading edge of road bed under the pavement to be destroyed.

A mounting plate 48 is secured to each side of the upper: hook arm 42 by means of a pin 50. The upper ends of said plates which extend above the arm 42 are connected. by means of a pin 54 to the bottom of the ramv 56, andl may be further secured to said ram by a weld joint 62..

to give the ram-plate connection added rigidity to witlt-` stand operating strains as the hook is moved during the pavement breaking operations. The ram 56 extendsl upwardly through a sleeve 58 in the platform section 12 to;y

a double acting cylinder 60 mounted on the platform sec!y tion 12 and imparting a vertical movement to thehookl for breaking the pavement.

the wheels 16 is borne by said pins-x pavement throughy a generally C-shaped break-up hook comprised of a pair of arms 40 and 42 interconnected by a cross arm 44.`

as'rs'poe ward of said hook and having rams 68. Conveniently,`

the ends of the rams 68 are attened and provided with suitable apertures receiving a pin 50 for joining said rams to the hook arm 42 and the plates 48. As shown in Fig. 3, the forward ends of the cylinders 66 are connected through a universal joint 72 to mounting brackets 74 on the back of the vehicle 76 so that said vehicle may Serve as a dead-man during the hook movements. Desirably, the brackets extend vertically to permit vertical adjustment of the forward end of the cylinders 66, so that they can be positioned to exert a substantially horizontal pull on the hook when it is disposed below the pavement level.

Primary connection between the apparatus and the vehicle 76 is provided by a telescoping hitch tongue 80. This telescoping movement may be accomplished by any suitable construction. As shown in Figs. l and 2, I prefer to accomplish said telescoping movement by providing a pair of U-shaped members rigidly joinedrtogether to forni an elongated outer sleeve 82. The side walls of the sleeve 82 are tapered at their rearward end to slip tightly over the end of the hook arm 42 and are welded thereon. The forward end of said sleeve is substantially enclosed by inwardly directed shoulders 86. Riding within the sleeve 82 is an inner tongue 88 mounted at its rearward end on a suitable truck having wheels 92 and axles 94. The forward end of said tongue is connected through a universal joint 96 to asuitable mounting bracket 98 on the vehicle 76. During the telescoping move- Ament of the hitch tongue the forward movement of the tongue 88 is halted by the wheels 92 abutting against the restriction formed by the shoulders 86 at the forward end of the sleeve 82.

Conveniently, the bracket 98 is provided with a plurality of vertically aligned holes 100 in which the tongue 88 may be secured by a pin 102. This permits vertical adjustability of said tongue for altering the pitch of the hook and permitting said tongue to be disposed substantially parallel with the pavement when the hook is in transporting or pavement-breaking position.

An eye-bolt 104 is mounted to each side of the outer sleeve 82 adjacent its forward end and is inter-connected by means of a chain 106 to one of the runners 30. Thus, upon forward movement of the hook, the tongue 80 contracts so that the chains 106 and the hook 40 pull the entire apparatus forward to prevent putting a strain on the hook ram 56 causing it to freeze in its cylinder 60. Conveniently, the chains 106 are provided with turnbuckles 108, or any other suitable means, for adjusting slack in the chains.

Desirably, all of the cylinders are hydraulically operated and controllable from a transporting vehicle 76. As shown in Fig. the hydraulic system for the cylinders is comprised of a pump 116 driven by a motor 118. The pump 116 has an intake 120 connected to a reservoir 122 and has a pressure outlet pipe 124 which branches to pipe 126 to carry the pump pressure to a wheel cylinder control valve 128; to pipe 130 to carry the pump pressure to the longitudinal hook mount control valve 132; and to pipe 134 to carry the pump pressure to the vertical hook movement control valve 136.

The vertical hook movement control valve 136 has four parts, one which communicates with the pressure pipe 134, and the opposite one 138 which connects to` the reservoir line 140. One side port 142 is connected to the bottom of the cylinder 60, and the opposite side port 144 is connected to the top of a cylinder 60. The valve is shown in closed position with its plug 146 closing the side ports 142 and 144. If it is rotated 45 in either direction from the position shown it connects the side ports respectively to the inlet and outlet ports to supply uid under pressure to one end of the cylinder 60 and to provide a discharge passage for uid from the other end of the cylinder to the reservoir.

The control valves 128 and 132 for the cylinders 66 and 22 respectively each are independent and operable by separate handles. Each valve is similar to the valve 136 and is operable in both directions to establish the proper hydraulic connection to reciprocate their respec- 1 tive rams for giving the wheels and the hook the desired directional movements.

The operation of my invention is as follows:

After the apparatus arrives at the desired work location, the tongue 30 and the cylinders 66 are lowered on their respective truck mounting brackets 98 and 74 so that they will exert a substantailly horizontal pull on the hook during the pavement breaking operations. The brakes on the vehicle 76 are set whereby the vehicle serves as a dead-man for all of the hook movements during the entire sequence of the pavement breaking operations. A narrow trench of suicient size to recelve the lower hook arm 40 is cut in the pavement and the valve 128 is then actuated to move the apparatus rearwardly until the hook arm 40 is positioned directly Iabove the trench. The wheels 16 are retracted by the action of the cylinders 22 operating in response to the valve 132; the apparatus then being supported onthe pavement by the runners 30 and their knife-edges 36 with the lower hook arm lying in the trench cut in thc pavement. The hook is lowered sufficiently by the cylinder 60 until the top of the arm 40 lies at a level just below the bottom layer of pavement to be broken as shown by the chain link lines of Fig. l. With the hook in this lowered position the cylinders 66 are actuated, and acting through the hook tongue and the chains 106, pull the entire apparatus forward; the knife-edges riding along the top of the pavement and the arm 40 riding below said pavement. When the hook has advanced sufficiently forward to bring the arm 44 in contact with the edge of the pavement, cylinder 60 is actuated to raise said hook, breaking the pavement during its upward movementas shown in Fig. 4. Due to the resistance of the pavement, the upward force of the hook produces a counter force downward on the runners and the knife-edges with the latter cutting into the pavement. These counter acting forces produce a fulcruming action which breaks the pavement within the laterally defined limits of the two runners 30. After this complete sequence of movements, the valve 128 is opened to allow the rams 68 in the cylinders 66 to extend as the vehicle is moved forwardly a distance equal to the length of the hook arm 40. The brakes of the vehicle are again set and the above described -sequence of hook movements are repeated.

I claim as my invention:

1.. An apparatus for breaking up pavement, comprising a supporting platform, ground traversing means mounted on said platform for transporting said apparatus, a pair of ground engageable runners extending downwardly from said platform, a break-up hook suspended from said platform, means for moving said hook vertically with respect to said platform and said runners, and a tongue on said hook adapted to be attached to a vehicle for moving the hook forward to an operating position and for transporting said apparatus from one work location to another.

2. An apparatus for breaking up pavement as defined in claim l in which said runners extend longitudinally beyond said platform.

3. An apparatus for breaking up pavement, comprising a supporting platform, ground traversing means mounted on said platform for transporting said apparatus, a pair of ground engageable runners extending downwardly from said platform, each of said runners having a knife-edge thereunder for cutting into the pavement, a break-up hook suspended from said platform, means for moving said hook vertically with respect to said platform, a tongue on said hook adapted to be attached to a vehicle for transporting said apparatus from one work location to another, and power means to move said hook longitudinally with respect to said vehicle.

4. An apparatus for breaking up pavement, comprising a supporting platform having a pair of ground engageable runners extending downwardly from said platform and longitudinally thereof, a pair of retractable transporting wheels mounted on said platform, a breakup hook suspended from said platform, means for moving said hook vertically and longitudinally, a tongue on said hook adapted to be attached to a vehicle for transporting said apparatus from one work location to another, and wheel carriers for said wheels which in lowered position interengage the runner structures to fix the wheels in transport position.

5. An apparatus for breaking up pavement, comprising a supporting platform having transporting wheels mounted thereon, a pair of ground engageable runners extending downwardly from said platform and longitudinally thereof, a break-up hook suspended from said platform, said hook having a pair of horizontal arm members interconnected by` a thirdI arm member, a hydraulic ram for vertically moving the lower arm of said hook from a retracted position above the pavement to a work position below said pavement, a pair of hydraulic rams adapted to interconnect said hook and a transporting vehicle to move said apparatus longitudinally with respect to said vehicle and telescoping means for `attaching said apparatus to said transporting vehicle.

6. An apparatus for breaking up pavement as defined in claim 5 with the addition that said pair of rarns are pivotally joined to said transporting vehicle.

7. An apparatus for breaking up pavement, comprising a supporting platform having transporting wheels mounted thereon, a pair o-f ground engageable runners extending downwardly from said platform and longitudinally thereof, a break-up hook suspended from said platform, means for moving said hook vertically and longitudinally, and a tongue on said hook for connecting said apparatus to a transporting vehicle, said tongue telescoping upon longitudinal movement of said hook to permit said hook to be moved longitudinally with respect to said vehicle.

8. An apparatus for breaking up pavement, comprising a supporting platform having transporting wheels mounted thereon, ground engageable runners extending downwardly from said platform and longitudinally thereof, a vertically moveable break-up hook suspended below said platform and adapted to engage and break upward the pavement disposed between the said runners, and means for adjusting the angle at which said hook engages the pavement and interconnecting said hook to a transporting vehicle.

9. An apparatus for breaking up pavement, comprising a platform having a pair of substantially parallel ground engaging runners, a pair of supporting wheels adjustable vertically with respect to said platform and runners to put either the wheels or runners in a plane higher than that of the other, a ground-lifting hook suspended between said ground engaging runners movable vertically with respect to said platform and runners, and movable longitudinally with the runners, and means for transmitting power to said device as a whole for moving it longitudinally on the runners.

10. An apparatus for breaking up pavement, comprising a pair of laterally spaced pavement-engaging runners adapted to define the lateral edges of a section of pavement to be broken up, a break-up hook extending longitudinally between said runners, a forward tongue adapted to interconnect said hook to a stationary object such as a draft vehicle, and power means for raising and lowering said hook with respect to said runners and for moving the hook and runners forward with respect to the stationary object, whereby said hook may be lowered to a level below a section of pavement, drawn forward below said pavement section, and then raised to break said section of pavement upward about said runners as a fulcrum.

11. An apparatus for breaking up pavement as set forth in claim l0 in which said hook comprises a pair of horizontal arm members interconnected by a third arm member, said third arm member upon forward movement of the hook below the pavement section engaging the rear edge of the pavement section to limit said forward hook movement.

12. An apparatus as set forth in claim l0 in which said apparatus is provided with a pair of retractable wheels having axes transverse to the tongue and movable between a retracted position in which they are disposed above the lower edge of the runners and a lowered position in which they are disposed below the lower edges of the hook and runners, said wheels in lowered position cooperating with said tongue to support the entire apparatus for rapid transport of the same by a draft vehicle from one work location to another.

13. An apparatus as set forth in claim 10 in which said tongue comprises telescopic members, and said power means for moving the hook forward is connected in parallel with said tongue to telescopically collapse the same.

14. An apparatus for breaking up pavement, comprising a pair of laterally spaced pavement-engaging runners adapted to deiine the lateral edges of a section of pavement to be broken up, a break-up hook parallel with and intermediate said runners, a forward tongue adapted to interconnect said hook to a stationary object such as a draft vehicle, and power means for raising and lowering said hook with respect to said runners and for moving the hook and runners forward with respect to the stationary object, whereby said hook may be lowered to a level below a section of pavement, drawn forward below said pavement section, and then raised to break said section of pavement upward about said runners as a fulcrum.

15. An apparatus for breaking up pavement, comprising a pair of laterally spaced pavement-engaging runners adapted to define the lateral edges of a section of pavement to be broken up, a break-up hook extending longitudinally between said runners, and power means for raising and lowering said hook with respect to said runners, and means for drawing said hook forward in lowered position to position the same beneath a pavement section defined by said runners, said means including an attachment for connection to a draft vehicle, whereby said hook may be lowered to a level below a section of pavement, drawn forward below said pavement section, and then raised to break said section of pavement upward about said runners as a fulcrum.

References Cited in the tile of this patent UNITED STATES PATENTS 615,698 Hardy Dec. 13, 1898 828,734 Gammie Aug. 14, 1906 1,844,124 Jordan Feb. 9, 1932 2,788,199 Ankersheil Apr. 9. 1957 

